EP2241755B1 - Hermetic compressor - Google Patents
Hermetic compressor Download PDFInfo
- Publication number
- EP2241755B1 EP2241755B1 EP10003484A EP10003484A EP2241755B1 EP 2241755 B1 EP2241755 B1 EP 2241755B1 EP 10003484 A EP10003484 A EP 10003484A EP 10003484 A EP10003484 A EP 10003484A EP 2241755 B1 EP2241755 B1 EP 2241755B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suction
- suction hole
- outlet portion
- hole
- suction muffler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000003507 refrigerant Substances 0.000 claims description 75
- 238000004891 communication Methods 0.000 claims description 42
- 230000006835 compression Effects 0.000 claims description 39
- 238000007906 compression Methods 0.000 claims description 39
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 208000010727 head pressing Diseases 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 10
- 239000013598 vector Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- -1 polybutylene terephthalate Polymers 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
- F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
Definitions
- the present invention relates to a suction muffler of a hermetic compressor used for a domestic electric refrigerator freezer, a display case and the like.
- this kind of hermetic compressor is structured such that a suction muffler is directly attached to a suction hole, as shown in Japanese Translation of PCT Publication No. 2001-503833 which represents the closest prior art.
- Fig. 5 is a vertical cross sectional view of a conventional hermetic compressor described in Japanese Translation of PCT Publication No. 2001-503833
- Fig. 6 is a cross sectional view of a substantial part of a refrigerant suction path of the hermetic compressor
- Fig. 7 is a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path of the hermetic compressor.
- compressor main body 3 is elastically supported in hermetic vessel 1 by suspension spring 5. Further, refrigerant gas 7 is filled in hermetic vessel 1.
- Compressor main body 3 is provided with electromotive element 9 and compression element 11 arranged above electromotive element 9, and electromotive element 9 has stator 13 and rotor 15.
- Compression element 11 is provided with crank shaft 21, cylinder block 25, piston 27, suction valve 33, and connecting means 35.
- crank shaft 21 is provided with eccentric shaft 17 and main shaft 19.
- Cylinder block 25 forms compression chamber 23.
- Suction valve 33 opens and closes suction hole 31.
- Suction hole 31 is provided in valve plate 29 sealing an opening end of compression chamber 23.
- Connecting means 35 couples eccentric shaft 17 and piston 27.
- Main shaft 19 is rotatably supported to bearing portion 37 of cylinder block 25. Further, rotor 15 is fixed to main shaft 19.
- suction muffler 41 is pinched and fixed by valve plate 29 and cylinder head 39.
- cylinder head 39 lids valve plate 29.
- Suction muffler 41 is molded from a resin such as polybutylene terephthalate (PBT). Suction muffler 41 is provided with muffler main body 45, inlet pipe 47, and communication pipe 51. In this case, muffler main body 45 forms sound absorbing space 43. Inlet pipe 47 communicates sound absorbing space 43 and a space inside hermetic vessel 1. Communication pipe 51 has suction muffler outlet portion 49, and suction muffler outlet portion 49 directly communicates sound absorbing space 43 and suction hole 31.
- PBT polybutylene terephthalate
- bent portion 53 is provided between suction muffler outlet portion 49 and communication pipe 51.
- Communication pipe 51 is arranged in such a manner as to extend in a vertical direction with respect to a center line passing through suction hole 31, and is fixed in such a manner that the entire regions of suction hole 31 is communicated with suction muffler outlet portion 49.
- Fig. 7 shows flow rate vectors 55 showing behavior of refrigerant gas 7 sucked into compression chamber 23 via communication pipe 51 obtained by a computer simulation.
- a length of each of flow rate vectors 55 indicates a magnitude of the flow rate, and a direction of flow rate vectors 55 indicates a flowing direction of refrigerant gas 7. Note that, in order to easily understand the flow of refrigerant gas 7, suction valve 33 is shown by a broken line.
- the hermetic compressor passes a current through stator 13 to generate a magnetic field, thereby rotating rotor 15 fixed to main shaft 19. This rotates crank shaft 21 to reciprocate piston 27 in compression chamber 23 through connecting means 35 rotatably attached to eccentric shaft 17.
- refrigerant gas 7 is suctioned into compression chamber 23, compressed, and then discharged to a refrigerating cycle (not shown) in repeating fashion.
- Refrigerant gas 7 returned from the refrigerating cycle in a suction stroke is introduced into compression chamber 23 via suction hole 31 communicating with compression chamber 23 according to the opening and closing of suction valve 33, through suction muffler 41.
- suction muffler 41 reduces a noise generated by an intermittent suction of refrigerant gas 7. Further, since suction muffler 41 is formed by a resin having a low thermal conductivity, it prevents refrigerant gas 7 passing through the inside of suction muffler 41 from being heated.
- suction muffler outlet portion 49 is communicated directly with suction hole 31, thereby preventing the noise from leaking. Further, suction muffler outlet portion 49 is communicated directly with suction hole 31, thereby preventing refrigerant gas 7 having a high temperature and heated by electromotive element 9 or the like from being sucked in hermetic vessel 1.
- a hermetic compressor in accordance with the present invention is provided with a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber, a piston reciprocating in the compression chamber, a valve plate arranged in an opening end of the compression chamber and forming a suction hole, a suction valve opening and closing the suction hole, a suction muffler forming a sound absorbing space and provided with a communication pipe, and a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber, wherein the communication pipe has a suction muffler outlet portion communicating with the suction hole, is arranged in such a manner as to extend in a vertical direction to a center line passing through the suction hole, and is arranged in such a manner that a part of the suction muffler outlet portion positioned in a downstream side of the refrigerant gas flowing through the communication pipe covers a part of the suction hole in a state in which the suction
- the hermetic compressor mentioned above is structured such that in the suction muffler outlet portion, a side in which the refrigerant gas flows more comes close to the center of the suction hole, whereby the refrigerant gas discharged from the suction muffler outlet portion flows into the vicinity of the center of the suction hole. Accordingly, it is possible to increase an effective area of the suction hole, and it is possible to improve volumetric efficiency.
- Fig. 1 is a vertical cross sectional view of a hermetic compressor in accordance with an embodiment of the present invention
- Fig. 2 is a cross sectional view of a substantial part of a refrigerant suction path of the hermetic compressor
- Fig. 3 is a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path of the hermetic compressor
- Fig. 4 is a characteristic comparative diagram showing a result of measurement of volumetric efficiency of the hermetic compressor.
- Fig. 4 is the characteristic comparative diagram showing the volumetric efficiency of the hermetic compressor in accordance with the present embodiment, at a time of setting volumetric efficiency of a conventional hermetic compressor to 1.
- the hermetic compressor in accordance with the embodiment of the present invention is structured such that oil 103 is reserved in an inner bottom portion of hermetic vessel 101, and is sealed refrigerant gas 105, for example, hydro carbon refrigerant R600a having a low global warming potential or the like, therein.
- refrigerant gas 105 for example, hydro carbon refrigerant R600a having a low global warming potential or the like
- hermetic vessel 101 is provided with suction pipe 107 formed by drawing an iron plate.
- Suction pipe 107 is communicated with an inner side of hermetic vessel 101 at its one end, and is connected to a low pressure side (not shown) of a refrigerating cycle at its other end.
- compressor main body 113 is elastically supported to hermetic vessel 101 by suspension spring 115, and is stored in hermetic vessel 101.
- compressor main body 113 is provided with compression element 109 and electromotive element 111. Further, compression element 109 is driven by electromotive element 111.
- Compression element 109 is constructed by crank shaft 117, block 119, piston 121, valve plate 143, suction valve 145, suction muffler 151, cylinder head 147, connecting means 123 and the like.
- Crank shaft 117 is provided with eccentric shaft 125 and main shaft 127, and is provided with oiling mechanism 129 constructed by a spiral groove, for example, provided in a surface of main shaft 127.
- Electromotive element 111 is constructed by stator 131 fixed to a lower side of block 119 by a bolt (not shown), and rotor 133 coaxially arranged inside stator 131 and fixed to main shaft 127 by shrink-fitting.
- Cylinder 137 forming compression chamber 135 is integrally formed in block 119, and block 119 is provided with bearing portion 139 rotatably supporting main shaft 127.
- valve plate 143, suction valve 145, and cylinder head 147 are pressed and fixed to an opening end of cylinder 137 in such a manner as to seal the opening end of cylinder 137 by head bolt 149. Further, suction muffler 151 is gripped and fixed to the opening end of cylinder 137 by valve plate 143 and cylinder head 147.
- valve plate 143 is provided with suction hole 141 and a discharge hole (not shown).
- valve plate 143 is arranged in an opening end of the compression chamber, and forms suction hole 141.
- Suction valve 145 opens and closes suction hole 141.
- Cylinder head 147 presses and fixes valve plate 143 to block 119 from an opposite side to the compression chamber. Accordingly, valve plate 143 is pinched and fixed by cylinder 137 and cylinder head 147.
- Suction muffler 151 is molded from a synthetic resin such as a polybutylene terephthalate (PBT) with mainly glass fiber added thereto. Further, suction muffler 151 is integrated by combining muffler main body 155 and cover 161, and forms sound absorbing space 163. In this case, muffler main body 155 is molded integrally with inlet pipe 153. Cover 161 is provided with communication pipe 159, and communication pipe 159 has cylindrical suction muffler outlet portion 157 communicating with suction hole 141.
- PBT polybutylene terephthalate
- bent portion 165 is arranged between suction muffler outlet portion 157 and communication pipe 159.
- Communication pipe 159 is arranged in such a manner as to extend in a vertical direction with respect to center line 190 vertically passing through suction hole 141 with respect to its opening surface.
- suction muffler outlet portion 157 is arranged at such a position that center line 192 vertically passing through with respect to an opening end surface is somewhat shifted below in the drawing with respect to center line 190 passing through suction hole 141.
- suction muffler 151 is arranged in such a manner that upward wall portion 157a of suction muffler outlet portion 157 positioned in a downstream side of refrigerant gas 105 flowing through communication pipe 159 laps over inner peripheral upper edge portion 141a of suction hole 141, in a state (as seen from a right side in Fig. 2 ) in which suction hole 141 is projected in a direction in which center line 190 vertically passing through with respect to the opening surface thereof extends, and an inlet lower portion peripheral edge of suction hole 141 is protruded in such a manner as to obstruct an inner peripheral lower edge of suction muffler outlet portion 157.
- respective shapes and dimensions of suction hole 141 and suction muffler outlet portion 157 are set such that upper wall portion 157a of suction muffler outlet portion 157 laps over inner peripheral upper edge portion 141a of suction hole 141 so as to cover a part of suction hole 141, in the projection state mentioned above, and the inlet lower portion peripheral edge of suction hole 141 protrudes with respect to the inner peripheral lower edge of suction muffle outlet portion 157, at a time when center lines 190 and 192 respectively passing through vertically suction hole 141 and suction muffler outlet portion 157 are in the somewhat shifted positional relationship as mentioned above.
- an area of suction hole 141 covered by the overlapping of wall portion 157a of suction muffler outlet portion 157 is set to about 17 % of a cross sectional area of cylindrical portion 180 mainly constructing suction hole 141.
- a maximum dimension (distance) in a radial direction of suction hole 141 covered by wall portion 157a of suction muffler outlet portion 157 is set to about 17 % of an inner diameter of cylindrical portion 180 mainly constructing suction hole 141.
- Valve plate 143 is formed of a sintered metal, and has suction flow path 167 conducting refrigerant gas 105 toward suction hole 141 in a peripheral edge of an inlet lower portion of suction hole 141 protruding with respect to an inner peripheral lower edge of suction muffler outlet portion 157, as mentioned above.
- Suction flow path 167 is communicated with suction muffler outlet portion 157. Further, suction flow path 167 is provided with guide portion 181 positioned in an upstream side of refrigerant gas 105 flowing through communication pipe 159. In other words, suction flow path 167 is a guide portion smoothening the flow of refrigerant gas 105 heading for suction hole 141 from an end surface close to suction muffler outlet portion 157.
- guide portion 181 is formed in such a shape that a cross section is curved like a round shape.
- gasket 169 is arranged between valve plate 143 and suction muffler 151. Gasket 169 is opposed to both of suction hole 141 of valve plate 143 and suction muffler outlet portion 157. Further, gasket 169 is provided with communication hole 171.
- communication hole 171 is formed at an opening area which is larger than an opening area of suction hole 141, and does not obstruct an opening area of suction muffler outlet portion 157, and is communicated with approximately all the opening area of suction muffler outlet portion 157. Further, communication hole 171 is structured such that center line 194 vertically passing through communication hole 171 with respect to an opening surface thereof is shifted slightly downward in Fig. 2 with respect to center line 190 passing through suction hole 141.
- Fig. 3 shows flow rate vectors 173 indicating behavior of refrigerant gas 105 sucked into compression chamber 135 via communication pipe 159 obtained by a computer simulation.
- a length of each of flow rate vectors 173 indicates a magnitude of the flow rate, and a direction of flow rate vectors 173 indicates a flowing direction of refrigerant gas 105.
- suction valve 145 is shown by a broken line.
- the hermetic compressor passes a current through stator 131 to generate a magnetic field, thereby rotating rotor 133 fixed to main shaft 127 to rotate crank shaft 117.
- piston 121 reciprocates in cylinder 137 via connecting means 123 rotatably attached to eccentric shaft 125.
- refrigerant gas 105 is sucked into compression chamber 135 via suction muffler 151 in accordance with a reciprocating motion of piston 121, and is discharged to the refrigerating cycle (not shown) after being compressed.
- piston 121 If piston 121 is actuated in a direction of increasing a volumetric capacity in compression chamber 135 from a top dead center, refrigerant gas 105 in compression chamber 135 is inflated. As a result, the pressure in compression chamber 135 is lowered, and suction valve 145 starts opening depending on a difference between the pressure in compression chamber 135 and the pressure in suction muffler 151.
- refrigerant gas 105 returning from the refrigerating cycle and having a low temperature is once released into hermetic vessel 101 from suction pipe 107, and is thereafter released to sound absorbing space 163 via inlet pipe 153 of suction muffler 151. Further, released refrigerant gas 105 flows into compression chamber 135 via communication pipe 159.
- suction muffler 151 constructs an expansion type muffler together with inlet pipe 153, communication pipe 159, and sound absorbing space 163. Further, since suction muffler 151 seals suction muffler outlet portion 157 and suction hole 141 so as to directly communicate, by arranging gasket 169 between suction muffler outlet portion 157 and valve plate 143, it reduces a noise generated by an intermittent suction of refrigerant gas 105. Further, it is possible to prevent refrigerant gas 105 heated by electromotive element 111 or the like in hermetic vessel 101 and having the high temperature from being sucked.
- suction muffler 151 is formed by a resin having a low thermal conductivity. Accordingly, it is possible to prevent overheating of refrigerant gas 105 passing through the inside of suction muffler 151 by being affected by a heat generation of electromotive element 111. As a result, since it is possible to suck refrigerant gas 105 having a large density into compression chamber 135, a mass flow rate of refrigerant gas 105 is increased, and it is possible to improve volumetric efficiency.
- suction muffler 151 has the bent portion which is bent at a right angle between suction muffler outlet portion 157 and communication pipe 159. Accordingly, as shown in Fig. 3 , dead water region (area) 17 having no flow of refrigerant gas 105 is generated in an inner peripheral side of bent portion 165. As a result, in suction muffler outlet portion 157, a density (a flow rate) of refrigerant gas 105 flowing through communication pipe 159 becomes higher in an outer side of bent portion 165 than in dead water region 175 side, refrigerant gas 7 is concentrated on the downstream side, and more refrigerant gas 105 flows while increasing a flow rate.
- suction muffler outlet portion 157 is arranged in such a manner that wall portion 157a corresponding to a part of suction muffler outlet portion 157 laps over the upper portion of suction hole 141 so as to cover suction hole 141, as seen from a direction (a right side in Fig. 2 ) of projecting in such a direction that center line 190 passing through suction hole 141 extends.
- a side in which refrigerant gas 105 of suction muffler outlet portion 157 flows more that is, an opposite side to a side in which dead water region 175 is formed comes close to center line 190 passing through suction hole 141.
- refrigerant gas 105 discharged from suction muffler outlet portion 157 tends to be conducted to suction hole 141 in the more flowing side.
- the opening area of suction hole 141 effectively serves as a passage of refrigerant gas 105, and refrigerant gas 105 is flowed into compression chamber 135.
- an area at which suction hole 141 is covered by wall portion 157a corresponding to a part of suction muffler outlet portion 157 is set to about 17 % of the opening area of cylindrical portion 180 mainly constructing suction hole 141.
- a maximum dimension (distance) in a radial direction of suction hole 141 covered by a part of suction muffler outlet portion 157 is set to about 17 % with respect to an inner diameter of cylindrical portion 180 of suction hole 141.
- suction hole 141 it is possible to increase an effective area of suction hole 141 without increasing a flow path resistance in the portion in which suction muffler outlet portion 157 and suction hole 141 are coupled, and it is possible to improve volumetric efficiency.
- the area of suction hole 141 covered by a part of suction muffler outlet portion 157 is set to about 17 %, however, it is confirmed that the same effect can be obtained as long as the area is in a range of being equal to or more than about 10 % and equal to or less than about 20 % of the opening area of cylindrical portion 180 mainly constructing suction hole 141.
- the area is equal to or more than about 10 % and equal to or less than about 20 %, it is possible to increase the effective area of suction hole 141 while making the flow path resistance approximately uniform, and it is possible to improve the volumetric efficiency.
- the same effect can be obtained by setting the maximum dimension (distance) in the radial direction of suction hole 141 covered by a part of suction muffler outlet portion 157 to a range of being equal to or more than about 5 % and equal to or less than about 20 % with respect to an inner diameter of cylindrical portion 180 mainly constructing suction hole 141, in a state of projecting suction muffler outlet portion 157 in the direction of center line 190 passing through suction hole 141.
- suction hole 141 of valve plate 143, and communication hole 171 of gasket 169 are formed by a concentric circle having approximately the same diameter, however, there is a case that a step is generated between suction hole 141 and communication hole 171 due to a working tolerance.
- a micro vortex is generated in the flow of refrigerant gas 105 discharged from suction muffler outlet portion 157, due to this step.
- a resistance is generated in the flow of refrigerant gas 105, and there is a possibility of lowering the volumetric efficiency.
- communication hole 171 is communicated with suction muffler outlet portion 157 in approximately all of the region, and is formed in such a manner that the opening area becomes larger than suction hole 141, and the opening area communicating with suction muffler outlet portion 157 becomes maximum.
- center line 194 passing through communication hole 171 is slightly deflected to an upstream side of refrigerant gas 105 flowing through communication pipe 159, from center line 190 passing through suction hole 141. Accordingly, since an end surface of communication hole 171 is arranged so as to face a region coming to dead water region 175 of suction muffler outlet portion 157, and can prevent the micro vortex from being generated, it is possible to reduce the flow resistance of refrigerant gas 105, and it is possible to improve efficiency.
- valve plate 143 has suction flow path 167 conducting the refrigerant gas toward suction hole 141 and having the curved cross section, and suction flow path 167 comes to a guide portion of refrigerant gas 105 heading for suction hole 141 from the end surface close to suction muffler outlet portion 157.
- suction flow path 167 comes to a guide portion of refrigerant gas 105 heading for suction hole 141 from the end surface close to suction muffler outlet portion 157.
- the flow of refrigerant gas 105 passing through suction flow path 167 becomes smooth by the curved surface of suction flow path 167, it is possible to prevent separation of the flow, and it is possible to conduct refrigerant gas 105 to suction hole 141 in a state in which a turbulence is small.
- suction flow path 167 it is possible to prevent the separation of the flow of refrigerant gas 105, to reduce the flow resistance of refrigerant gas 105 flowing into suction hole 141 from suction muffler outlet portion 157, and to further improve the volumetric efficiency, by forming suction flow path 167.
- suction flow path 167 is formed by guide portion 181 having the curved shape.
- guide portion 181 may be formed in such a manner that the cross section thereof comes to a shape forming an inclined surface having a slope about 45 degrees with respect to the center line passing through suction hole 141.
- the flow path resistance is increased more than the curved shape, however, it is possible to prevent the separation of the flow of refrigerant gas 105 in comparison with the conventional structure.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Description
- The present invention relates to a suction muffler of a hermetic compressor used for a domestic electric refrigerator freezer, a display case and the like.
- In recent years, there has been an increasingly strong request for global environment protection, and in a refrigerator and the other refrigerating cycle apparatuses, there has been a strong demand particularly for high efficiency. Conventionally, this kind of hermetic compressor is structured such that a suction muffler is directly attached to a suction hole, as shown in Japanese Translation of
PCT Publication No. 2001-503833 - A description will be given below of the conventional hermetic compressor mentioned above with reference to the drawings.
-
Fig. 5 is a vertical cross sectional view of a conventional hermetic compressor described in Japanese Translation ofPCT Publication No. 2001-503833 Fig. 6 is a cross sectional view of a substantial part of a refrigerant suction path of the hermetic compressor, andFig. 7 is a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path of the hermetic compressor. - In
Figs. 5 and6 , compressormain body 3 is elastically supported inhermetic vessel 1 bysuspension spring 5. Further,refrigerant gas 7 is filled inhermetic vessel 1. - Compressor
main body 3 is provided withelectromotive element 9 andcompression element 11 arranged aboveelectromotive element 9, andelectromotive element 9 hasstator 13 androtor 15. -
Compression element 11 is provided withcrank shaft 21,cylinder block 25,piston 27,suction valve 33, and connecting means 35. In this case,crank shaft 21 is provided witheccentric shaft 17 andmain shaft 19.Cylinder block 25forms compression chamber 23.Suction valve 33 opens and closessuction hole 31.Suction hole 31 is provided invalve plate 29 sealing an opening end ofcompression chamber 23. Connecting means 35 coupleseccentric shaft 17 andpiston 27. -
Main shaft 19 is rotatably supported to bearingportion 37 ofcylinder block 25. Further,rotor 15 is fixed tomain shaft 19. - Further,
suction muffler 41 is pinched and fixed byvalve plate 29 andcylinder head 39. In this case,cylinder head 39lids valve plate 29. -
Suction muffler 41 is molded from a resin such as polybutylene terephthalate (PBT).Suction muffler 41 is provided with mufflermain body 45,inlet pipe 47, andcommunication pipe 51. In this case, mufflermain body 45 forms sound absorbingspace 43.Inlet pipe 47 communicates sound absorbingspace 43 and a space insidehermetic vessel 1.Communication pipe 51 has suctionmuffler outlet portion 49, and suctionmuffler outlet portion 49 directly communicatessound absorbing space 43 andsuction hole 31. - Further,
bent portion 53 is provided between suctionmuffler outlet portion 49 andcommunication pipe 51.Communication pipe 51 is arranged in such a manner as to extend in a vertical direction with respect to a center line passing throughsuction hole 31, and is fixed in such a manner that the entire regions ofsuction hole 31 is communicated with suctionmuffler outlet portion 49. -
Fig. 7 showsflow rate vectors 55 showing behavior ofrefrigerant gas 7 sucked intocompression chamber 23 viacommunication pipe 51 obtained by a computer simulation. A length of each offlow rate vectors 55 indicates a magnitude of the flow rate, and a direction offlow rate vectors 55 indicates a flowing direction ofrefrigerant gas 7. Note that, in order to easily understand the flow ofrefrigerant gas 7,suction valve 33 is shown by a broken line. - A description will be given below of a motion of the conventional hermetic compressor constructed as mentioned above.
- First, the hermetic compressor passes a current through
stator 13 to generate a magnetic field, thereby rotatingrotor 15 fixed tomain shaft 19. This rotatescrank shaft 21 to reciprocatepiston 27 incompression chamber 23 through connecting means 35 rotatably attached toeccentric shaft 17. - With the reciprocating motion of
piston 27,refrigerant gas 7 is suctioned intocompression chamber 23, compressed, and then discharged to a refrigerating cycle (not shown) in repeating fashion. -
Refrigerant gas 7 returned from the refrigerating cycle in a suction stroke is introduced intocompression chamber 23 viasuction hole 31 communicating withcompression chamber 23 according to the opening and closing ofsuction valve 33, throughsuction muffler 41. - In this case,
suction muffler 41 reduces a noise generated by an intermittent suction ofrefrigerant gas 7. Further, sincesuction muffler 41 is formed by a resin having a low thermal conductivity, it preventsrefrigerant gas 7 passing through the inside ofsuction muffler 41 from being heated. - Further, suction
muffler outlet portion 49 is communicated directly withsuction hole 31, thereby preventing the noise from leaking. Further, suctionmuffler outlet portion 49 is communicated directly withsuction hole 31, thereby preventingrefrigerant gas 7 having a high temperature and heated byelectromotive element 9 or the like from being sucked inhermetic vessel 1. - However, in the conventional structure mentioned above, since
communication pipe 51 and suctionmuffler outlet portion 49 havebent portion 53 which is vertically bent, dead water region (area) 57 having no flow ofrefrigerant gas 7 is generated in an inner peripheral side ofbent portion 53, as shown inFig. 7 . Sincedead water region 57 is formed, a flow path area ofrefrigerant gas 7 becomes small. Accordingly, in suctionmuffler outlet portion 49, a density (a flow rate) ofrefrigerant gas 7 flowing throughcommunication pipe 51 becomes more in an outer side ofbent portion 53 than that indead water region 57 side,refrigerant gas 7 is concentrated on a downstream side, andmore refrigerant gas 7 flows while increasing a flow rate. Therefore,dead water region 59 having no flow ofrefrigerant gas 7 is generated insuction hole 31, an effective area coming to the refrigerant gas passage ofsuction hole 31 becomes small, and there is a problem of deteriorating volumetric efficiency. - A hermetic compressor in accordance with the present invention is provided with a block accommodating a compression element driven by a electromotive element within a hermetic vessel, the compression element forming a compression chamber, a piston reciprocating in the compression chamber, a valve plate arranged in an opening end of the compression chamber and forming a suction hole, a suction valve opening and closing the suction hole, a suction muffler forming a sound absorbing space and provided with a communication pipe, and a cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber, wherein the communication pipe has a suction muffler outlet portion communicating with the suction hole, is arranged in such a manner as to extend in a vertical direction to a center line passing through the suction hole, and is arranged in such a manner that a part of the suction muffler outlet portion positioned in a downstream side of the refrigerant gas flowing through the communication pipe covers a part of the suction hole in a state in which the suction muffler outlet portion is projected in a center line direction.
- The hermetic compressor mentioned above is structured such that in the suction muffler outlet portion, a side in which the refrigerant gas flows more comes close to the center of the suction hole, whereby the refrigerant gas discharged from the suction muffler outlet portion flows into the vicinity of the center of the suction hole. Accordingly, it is possible to increase an effective area of the suction hole, and it is possible to improve volumetric efficiency.
-
-
Fig. 1 shows a vertical cross sectional view of a hermetic compressor in accordance with a embodiment of the present invention; -
Fig. 2 shows a cross sectional view of a substantial part of a refrigerant suction path of the hermetic compressor in accordance with the embodiment; -
Fig. 3 shows a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path in accordance with the embodiment; -
Fig. 4 shows a characteristic comparative diagram showing a result of measurement of volumetric efficiency of the hermetic compressor in accordance with the embodiment; -
Fig. 5 shows a vertical cross sectional view of a conventional hermetic compressor; -
Fig. 6 shows a cross sectional view of a substantial part of a refrigerant suction path of the conventional hermetic compressor; and -
Fig. 7 shows a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path of the conventional hermetic compressor. - A description will be given below of an embodiment in accordance with the present invention with reference to the accompanying drawings. It should be noted that this invention is not limited by this embodiment.
-
Fig. 1 is a vertical cross sectional view of a hermetic compressor in accordance with an embodiment of the present invention,Fig. 2 is a cross sectional view of a substantial part of a refrigerant suction path of the hermetic compressor,Fig. 3 is a flow rate vector diagram showing refrigerant gas behavior in the refrigerant suction path of the hermetic compressor,Fig. 4 is a characteristic comparative diagram showing a result of measurement of volumetric efficiency of the hermetic compressor.Fig. 4 is the characteristic comparative diagram showing the volumetric efficiency of the hermetic compressor in accordance with the present embodiment, at a time of setting volumetric efficiency of a conventional hermetic compressor to 1. - In
Figs. 1 and2 , the hermetic compressor in accordance with the embodiment of the present invention is structured such thatoil 103 is reserved in an inner bottom portion ofhermetic vessel 101, and is sealedrefrigerant gas 105, for example, hydro carbon refrigerant R600a having a low global warming potential or the like, therein. - Further,
hermetic vessel 101 is provided withsuction pipe 107 formed by drawing an iron plate.Suction pipe 107 is communicated with an inner side ofhermetic vessel 101 at its one end, and is connected to a low pressure side (not shown) of a refrigerating cycle at its other end. - Further, compressor
main body 113 is elastically supported tohermetic vessel 101 bysuspension spring 115, and is stored inhermetic vessel 101. In this case, compressormain body 113 is provided withcompression element 109 andelectromotive element 111. Further,compression element 109 is driven byelectromotive element 111. -
Compression element 109 is constructed bycrank shaft 117, block 119,piston 121,valve plate 143,suction valve 145,suction muffler 151,cylinder head 147, connecting means 123 and the like. Crankshaft 117 is provided witheccentric shaft 125 andmain shaft 127, and is provided withoiling mechanism 129 constructed by a spiral groove, for example, provided in a surface ofmain shaft 127. -
Electromotive element 111 is constructed bystator 131 fixed to a lower side ofblock 119 by a bolt (not shown), androtor 133 coaxially arranged insidestator 131 and fixed tomain shaft 127 by shrink-fitting. -
Cylinder 137 formingcompression chamber 135 is integrally formed inblock 119, and block 119 is provided with bearingportion 139 rotatably supportingmain shaft 127. - Further,
valve plate 143,suction valve 145, andcylinder head 147 are pressed and fixed to an opening end ofcylinder 137 in such a manner as to seal the opening end ofcylinder 137 byhead bolt 149. Further,suction muffler 151 is gripped and fixed to the opening end ofcylinder 137 byvalve plate 143 andcylinder head 147. In this case,valve plate 143 is provided withsuction hole 141 and a discharge hole (not shown). In other words,valve plate 143 is arranged in an opening end of the compression chamber, and formssuction hole 141.Suction valve 145 opens and closessuction hole 141.Cylinder head 147 presses and fixesvalve plate 143 to block 119 from an opposite side to the compression chamber. Accordingly,valve plate 143 is pinched and fixed bycylinder 137 andcylinder head 147. -
Suction muffler 151 is molded from a synthetic resin such as a polybutylene terephthalate (PBT) with mainly glass fiber added thereto. Further,suction muffler 151 is integrated by combining mufflermain body 155 and cover 161, and forms sound absorbingspace 163. In this case, mufflermain body 155 is molded integrally withinlet pipe 153. Cover 161 is provided withcommunication pipe 159, andcommunication pipe 159 has cylindrical suctionmuffler outlet portion 157 communicating withsuction hole 141. - Further,
bent portion 165 is arranged between suctionmuffler outlet portion 157 andcommunication pipe 159.Communication pipe 159 is arranged in such a manner as to extend in a vertical direction with respect tocenter line 190 vertically passing throughsuction hole 141 with respect to its opening surface. - Further, suction
muffler outlet portion 157 is arranged at such a position that centerline 192 vertically passing through with respect to an opening end surface is somewhat shifted below in the drawing with respect tocenter line 190 passing throughsuction hole 141. - In other words, describing with reference to
Fig. 2 ,suction muffler 151 is arranged in such a manner thatupward wall portion 157a of suctionmuffler outlet portion 157 positioned in a downstream side ofrefrigerant gas 105 flowing throughcommunication pipe 159 laps over inner peripheralupper edge portion 141a ofsuction hole 141, in a state (as seen from a right side inFig. 2 ) in whichsuction hole 141 is projected in a direction in whichcenter line 190 vertically passing through with respect to the opening surface thereof extends, and an inlet lower portion peripheral edge ofsuction hole 141 is protruded in such a manner as to obstruct an inner peripheral lower edge of suctionmuffler outlet portion 157. - In other words, respective shapes and dimensions of
suction hole 141 and suctionmuffler outlet portion 157 are set such thatupper wall portion 157a of suctionmuffler outlet portion 157 laps over inner peripheralupper edge portion 141a ofsuction hole 141 so as to cover a part ofsuction hole 141, in the projection state mentioned above, and the inlet lower portion peripheral edge ofsuction hole 141 protrudes with respect to the inner peripheral lower edge of suctionmuffle outlet portion 157, at a time whencenter lines suction hole 141 and suctionmuffler outlet portion 157 are in the somewhat shifted positional relationship as mentioned above. - In this case, in the embodiment in accordance with the present invention, an area of
suction hole 141 covered by the overlapping ofwall portion 157a of suctionmuffler outlet portion 157 is set to about 17 % of a cross sectional area ofcylindrical portion 180 mainly constructingsuction hole 141. As a result, a maximum dimension (distance) in a radial direction ofsuction hole 141 covered bywall portion 157a of suctionmuffler outlet portion 157 is set to about 17 % of an inner diameter ofcylindrical portion 180 mainly constructingsuction hole 141. -
Valve plate 143 is formed of a sintered metal, and hassuction flow path 167 conductingrefrigerant gas 105 towardsuction hole 141 in a peripheral edge of an inlet lower portion ofsuction hole 141 protruding with respect to an inner peripheral lower edge of suctionmuffler outlet portion 157, as mentioned above. -
Suction flow path 167 is communicated with suctionmuffler outlet portion 157. Further,suction flow path 167 is provided withguide portion 181 positioned in an upstream side ofrefrigerant gas 105 flowing throughcommunication pipe 159. In other words,suction flow path 167 is a guide portion smoothening the flow ofrefrigerant gas 105 heading forsuction hole 141 from an end surface close to suctionmuffler outlet portion 157. - Specifically,
guide portion 181 is formed in such a shape that a cross section is curved like a round shape. - Further,
gasket 169 is arranged betweenvalve plate 143 andsuction muffler 151.Gasket 169 is opposed to both ofsuction hole 141 ofvalve plate 143 and suctionmuffler outlet portion 157. Further,gasket 169 is provided withcommunication hole 171. - Further,
communication hole 171 is formed at an opening area which is larger than an opening area ofsuction hole 141, and does not obstruct an opening area of suctionmuffler outlet portion 157, and is communicated with approximately all the opening area of suctionmuffler outlet portion 157. Further,communication hole 171 is structured such thatcenter line 194 vertically passing throughcommunication hole 171 with respect to an opening surface thereof is shifted slightly downward inFig. 2 with respect tocenter line 190 passing throughsuction hole 141. -
Fig. 3 showsflow rate vectors 173 indicating behavior ofrefrigerant gas 105 sucked intocompression chamber 135 viacommunication pipe 159 obtained by a computer simulation. A length of each offlow rate vectors 173 indicates a magnitude of the flow rate, and a direction offlow rate vectors 173 indicates a flowing direction ofrefrigerant gas 105. In this case, in order to easily understand the flow ofrefrigerant gas 105,suction valve 145 is shown by a broken line. - A description will be given below of a motion and an operation of the hermetic compressor constructed as mentioned above.
- The hermetic compressor passes a current through
stator 131 to generate a magnetic field, thereby rotatingrotor 133 fixed tomain shaft 127 to rotate crankshaft 117. As a result,piston 121 reciprocates incylinder 137 via connectingmeans 123 rotatably attached toeccentric shaft 125. Further,refrigerant gas 105 is sucked intocompression chamber 135 viasuction muffler 151 in accordance with a reciprocating motion ofpiston 121, and is discharged to the refrigerating cycle (not shown) after being compressed. - Next, a description will be given of a suction stroke of the hermetic compressor.
- If
piston 121 is actuated in a direction of increasing a volumetric capacity incompression chamber 135 from a top dead center,refrigerant gas 105 incompression chamber 135 is inflated. As a result, the pressure incompression chamber 135 is lowered, andsuction valve 145 starts opening depending on a difference between the pressure incompression chamber 135 and the pressure insuction muffler 151. - Further,
refrigerant gas 105 returning from the refrigerating cycle and having a low temperature is once released intohermetic vessel 101 fromsuction pipe 107, and is thereafter released to sound absorbingspace 163 viainlet pipe 153 ofsuction muffler 151. Further, releasedrefrigerant gas 105 flows intocompression chamber 135 viacommunication pipe 159. - Thereafter, if the motion of
piston 121 is turned to a direction of reducing the volumetric capacity incompression chamber 135 from a bottom dead center, the pressure incompression chamber 135 rises. Further,suction valve 145 is closed depending on a difference between the pressure incompression chamber 135 and the pressure insuction muffler 151. - In this case,
suction muffler 151 constructs an expansion type muffler together withinlet pipe 153,communication pipe 159, andsound absorbing space 163. Further, sincesuction muffler 151 seals suctionmuffler outlet portion 157 andsuction hole 141 so as to directly communicate, by arranginggasket 169 between suctionmuffler outlet portion 157 andvalve plate 143, it reduces a noise generated by an intermittent suction ofrefrigerant gas 105. Further, it is possible to preventrefrigerant gas 105 heated byelectromotive element 111 or the like inhermetic vessel 101 and having the high temperature from being sucked. - Further,
suction muffler 151 is formed by a resin having a low thermal conductivity. Accordingly, it is possible to prevent overheating ofrefrigerant gas 105 passing through the inside ofsuction muffler 151 by being affected by a heat generation ofelectromotive element 111. As a result, since it is possible to suckrefrigerant gas 105 having a large density intocompression chamber 135, a mass flow rate ofrefrigerant gas 105 is increased, and it is possible to improve volumetric efficiency. - In this case,
suction muffler 151 has the bent portion which is bent at a right angle between suctionmuffler outlet portion 157 andcommunication pipe 159. Accordingly, as shown inFig. 3 , dead water region (area) 17 having no flow ofrefrigerant gas 105 is generated in an inner peripheral side ofbent portion 165. As a result, in suctionmuffler outlet portion 157, a density (a flow rate) ofrefrigerant gas 105 flowing throughcommunication pipe 159 becomes higher in an outer side ofbent portion 165 than indead water region 175 side,refrigerant gas 7 is concentrated on the downstream side, and morerefrigerant gas 105 flows while increasing a flow rate. - However, in
suction muffler 151 of the hermetic compressor in accordance with the present embodiment, suctionmuffler outlet portion 157 is arranged in such a manner thatwall portion 157a corresponding to a part of suctionmuffler outlet portion 157 laps over the upper portion ofsuction hole 141 so as to coversuction hole 141, as seen from a direction (a right side inFig. 2 ) of projecting in such a direction that centerline 190 passing throughsuction hole 141 extends. As a result, as shown inFig. 3 , a side in whichrefrigerant gas 105 of suctionmuffler outlet portion 157 flows more, that is, an opposite side to a side in whichdead water region 175 is formed comes close tocenter line 190 passing throughsuction hole 141. - Accordingly,
refrigerant gas 105 discharged from suctionmuffler outlet portion 157 tends to be conducted tosuction hole 141 in the more flowing side. As a result, it is believed that the opening area ofsuction hole 141 effectively serves as a passage ofrefrigerant gas 105, andrefrigerant gas 105 is flowed intocompression chamber 135. - Further, in a state in which suction
muffler outlet portion 157 is projected in the direction ofcenter line 190 passing throughsuction hole 141, an area at whichsuction hole 141 is covered bywall portion 157a corresponding to a part of suctionmuffler outlet portion 157 is set to about 17 % of the opening area ofcylindrical portion 180 mainly constructingsuction hole 141. Further, a maximum dimension (distance) in a radial direction ofsuction hole 141 covered by a part of suctionmuffler outlet portion 157 is set to about 17 % with respect to an inner diameter ofcylindrical portion 180 ofsuction hole 141. - As a result, it is possible to increase an effective area of
suction hole 141 without increasing a flow path resistance in the portion in which suctionmuffler outlet portion 157 andsuction hole 141 are coupled, and it is possible to improve volumetric efficiency. - In this case, in the embodiment in accordance with the present invention, the area of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 is set to about 17 %, however, it is confirmed that the same effect can be obtained as long as the area is in a range of being equal to or more than about 10 % and equal to or less than about 20 % of the opening area ofcylindrical portion 180 mainly constructingsuction hole 141. In other words, in the range in which the area is equal to or more than about 10 % and equal to or less than about 20 %, it is possible to increase the effective area ofsuction hole 141 while making the flow path resistance approximately uniform, and it is possible to improve the volumetric efficiency. - The above results is a result obtained by setting the area of
suction hole 141 covered bywall portion 157a corresponding to a part of suctionmuffler outlet portion 157 to a proper range, there can be through that if the area is set to be too small with respect to the opening area ofcylindrical portion 180, the effect of reducing the flow path resistance by making the main flow ofrefrigerant gas 105 of suctionmuffler outlet portion 157 close tocenter line 190 passing throughsuction hole 141 becomes small, and it is impossible to achieve an improvement of the volumetric efficiency. - On the contrary, if the opening area of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 is set to be too large with respect to the opening area ofcylindrical portion 180, a substantial flow path area ofcylindrical portion 180 becomes small. Accordingly, it is believed that the effect of reducing the flow path resistance is reduced. - Further, it is confirmed that the same effect can be obtained by setting the maximum dimension (distance) in the radial direction of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 to a range of being equal to or more than about 5 % and equal to or less than about 20 % with respect to an inner diameter ofcylindrical portion 180 mainly constructingsuction hole 141, in a state of projecting suctionmuffler outlet portion 157 in the direction ofcenter line 190 passing throughsuction hole 141. - In accordance with the result mentioned above, in the same manner, it is believed that if the maximum dimension (distance) in the radial direction of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 is set to be too small with respect to the inner diameter ofcylindrical portion 180 mainly constructingsuction hole 141, the effect of reducing the flow path resistance by making the main flow ofrefrigerant gas 105 of suctionmuffler outlet portion 157 close tocenter line 190 passing throughsuction hole 141 becomes small. - On the contrary, if the maximum dimension (distance) in the radial direction of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 is set to be too large with respect to the inner diameter ofcylindrical portion 180 mainly constructingsuction hole 141, the substantial flow path cross sectional area ofcylindrical portion 180 becomes small. Accordingly, it is believed that the effect of reducing the flow path resistance is reduced. - As mentioned above, it is possible to achieve a reduction of the flow path resistance, by paying attention to a ratio of the area of
suction hole 141 covered by a part of suctionmuffler outlet portion 157 with respect to an opening area ofcylindrical portion 180, and a ratio of a maximum dimension (distance) in a radial direction ofsuction hole 141 covered by a part of suctionmuffler outlet portion 157 with respect to an inner diameter ofcylindrical portion 180. - Next, a description will be given of a relation among
suction hole 141 ofvalve plate 143,communication hole 171 ofgasket 169 and suctionmuffler outlet portion 157. - Conventionally,
suction hole 141 ofvalve plate 143, andcommunication hole 171 ofgasket 169 are formed by a concentric circle having approximately the same diameter, however, there is a case that a step is generated betweensuction hole 141 andcommunication hole 171 due to a working tolerance. A micro vortex is generated in the flow ofrefrigerant gas 105 discharged from suctionmuffler outlet portion 157, due to this step. As a result, a resistance is generated in the flow ofrefrigerant gas 105, and there is a possibility of lowering the volumetric efficiency. - Accordingly,
communication hole 171 is communicated with suctionmuffler outlet portion 157 in approximately all of the region, and is formed in such a manner that the opening area becomes larger thansuction hole 141, and the opening area communicating with suctionmuffler outlet portion 157 becomes maximum. - Further,
center line 194 passing throughcommunication hole 171 is slightly deflected to an upstream side ofrefrigerant gas 105 flowing throughcommunication pipe 159, fromcenter line 190 passing throughsuction hole 141. Accordingly, since an end surface ofcommunication hole 171 is arranged so as to face a region coming todead water region 175 of suctionmuffler outlet portion 157, and can prevent the micro vortex from being generated, it is possible to reduce the flow resistance ofrefrigerant gas 105, and it is possible to improve efficiency. - Further,
valve plate 143 hassuction flow path 167 conducting the refrigerant gas towardsuction hole 141 and having the curved cross section, andsuction flow path 167 comes to a guide portion ofrefrigerant gas 105 heading forsuction hole 141 from the end surface close to suctionmuffler outlet portion 157. In other words, the flow ofrefrigerant gas 105 passing throughsuction flow path 167 becomes smooth by the curved surface ofsuction flow path 167, it is possible to prevent separation of the flow, and it is possible to conductrefrigerant gas 105 tosuction hole 141 in a state in which a turbulence is small. - Further, it is possible to prevent the separation of the flow of
refrigerant gas 105, to reduce the flow resistance ofrefrigerant gas 105 flowing intosuction hole 141 from suctionmuffler outlet portion 157, and to further improve the volumetric efficiency, by formingsuction flow path 167. - In this case, in the embodiment in accordance with the present invention,
suction flow path 167 is formed byguide portion 181 having the curved shape. However,guide portion 181 may be formed in such a manner that the cross section thereof comes to a shape forming an inclined surface having a slope about 45 degrees with respect to the center line passing throughsuction hole 141. In the shape of the inclined surface mentioned above, the flow path resistance is increased more than the curved shape, however, it is possible to prevent the separation of the flow ofrefrigerant gas 105 in comparison with the conventional structure. - As a result of the above, it is possible to increase
refrigerant gas 105 flowing insuction hole 141, and an improvement of the volumetric efficiency by about 2 % in comparison with the conventional structure is confirmed by the experiment as shown inFig. 4 .
Claims (7)
- A hermetic compressor comprising:a block (119) accommodating a compression element (109) driven by a electromotive element (111) within a hermetic vessel (101), the compression element forming a compression chamber (135);a piston (121) reciprocating in the compression chamber;a valve plate (143) arranged in an opening end of the compression chamber and forming a suction hole (141),a suction valve (145) opening and closing the suction hole;a suction muffler (151) forming a sound absorbing space and provided with a communication pipe (159); anda cylinder head pressing and fixing the valve plate to the block from an opposite side to the compression chamber, characterised in thatthe communication pipe (135) as a suction muffler outlet portion communicating with the suction hole, is arranged in such a manner as to extend in a vertical direction to a center line (190) passing through the suction hole, and is arranged in such a manner that a part of the suction muffler outlet portion positioned in a downstream side of refrigerant gas flowing through the communication pipe covers a part of the suction hole (141) in a state in which the suction muffler outlet portion is projected in a direction of the center line.
- The hermetic compressor according to claim 1, wherein a cross sectional area of the suction hole covered by a part of the suction muffler outlet portion is in a range of being equal to or more than 10 % and equal to or less than 20 % of a cross sectional area of a cylindrical portion of the suction hole, in a projection in the direction of the center line.
- The hermetic compressor according to claim 1, wherein a maximum dimension (distance) in a radial direction of the suction hole covered by a part of the suction muffler outlet portion is in a range of being equal to or more than 5 % and equal to or less than 20 % of an inner diameter of the cylindrical portion of the suction hole, in a projection in the direction of the center line.
- The hermetic compressor according to claim 1, wherein a gasket is arranged between the valve plate and the suction muffler, the gasket is provided with a communication hole which is opposed to both of the suction hole and the suction muffler outlet portion and communicates the suction hole and the suction muffler outlet portion, a center of the communication hole is deflected to an upstream side of the refrigerant gas flowing through the communication pipe from the center of the suction hole, a cross sectional area of the communication hole is larger than a cross sectional area of the suction hole, and the entire region of the communication hole is arranged in such a manner as to be communicated with the suction muffler outlet portion.
- The hermetic compressor according to claim 4, wherein the communication hole is formed in such a manner that the cross sectional area communicating with the suction muffler outlet portion becomes maximum.
- The hermetic compressor according to claim 1, wherein the valve plate has a suction flow path guiding the refrigerant gas toward the suction hole, and the suction flow path is a guide portion heading for the suction hole from an end surface close to the suction muffler outlet portion.
- The hermetic compressor according to claim 6, wherein the guide portion is communicated with the suction muffler outlet portion, and is provided in the suction hole in an upstream side of the refrigerant gas flowing through the communication pipe, in a projection in the center line.
Applications Claiming Priority (1)
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JP2009095845A JP5560580B2 (en) | 2009-04-10 | 2009-04-10 | Hermetic compressor |
Publications (4)
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EP2241755A2 EP2241755A2 (en) | 2010-10-20 |
EP2241755A3 EP2241755A3 (en) | 2011-10-05 |
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US (1) | US8323001B2 (en) |
EP (1) | EP2241755B8 (en) |
JP (1) | JP5560580B2 (en) |
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JP5560580B2 (en) * | 2009-04-10 | 2014-07-30 | パナソニック株式会社 | Hermetic compressor |
BR112015012766A2 (en) * | 2012-12-05 | 2017-07-11 | Arcelik As | hermetic compressor with suction silencer |
WO2014091764A1 (en) * | 2012-12-13 | 2014-06-19 | パナソニック株式会社 | Hermetic compressor and refrigeration device |
JP6164135B2 (en) * | 2014-03-27 | 2017-07-19 | 株式会社豊田自動織機 | Compressor |
JP2018502252A (en) * | 2014-12-29 | 2018-01-25 | クルトン プレミア カンパニー リミテッドKulthorn Premier Company Limited | Valve plate with modified suction holes to increase refrigerant flow for the compressor |
WO2016139267A1 (en) * | 2015-03-04 | 2016-09-09 | Arcelik Anonim Sirketi | A compressor comprising a suction muffler |
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KR100390492B1 (en) * | 2000-07-13 | 2003-07-04 | 엘지전자 주식회사 | Apparatus for reducing noise of suction muffler in compressor |
BR0003292A (en) * | 2000-07-17 | 2002-02-26 | Brasil Compressores S A | Arrangement of suction and discharge valves for small hermetic compressor |
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-
2009
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2010
- 2010-03-30 EP EP10003484.2A patent/EP2241755B8/en active Active
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EP2241755B8 (en) | 2013-04-10 |
US20100260621A1 (en) | 2010-10-14 |
KR20100113037A (en) | 2010-10-20 |
CN101858328B (en) | 2013-01-16 |
KR101676876B1 (en) | 2016-11-16 |
US8323001B2 (en) | 2012-12-04 |
CN101858328A (en) | 2010-10-13 |
EP2241755A2 (en) | 2010-10-20 |
JP5560580B2 (en) | 2014-07-30 |
EP2241755A3 (en) | 2011-10-05 |
JP2010248912A (en) | 2010-11-04 |
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